Ejector technology for the shipbuilding industry
Bilge ejectors are fluidic devices without mechanical drives, dynamic gaskets or any moving parts. Therefore, they are not subjected to mechanical wear, require no maintenance and dry running isn’t possible. Even an operation free of cavitation can be ensured if a design is project related. The functionality of selfpriming bilge ejectors is solely based on fluid dynamics, driven by water supplied by the mechanical pumps from the ship’s own system. In order to achieve optimum efficiency, the design of a bilge ejector should always be based on the performance data at the design point. The effective pressure data in relation to the connections must be taken into consideration.
Lower the operating costs
The standardisation of bilge ejectors has an adverse affect and results in a loss of efficiency. On the other hand, detailed planning at an early stage leads to lower investment and operating costs. However, when selecting a bilge ejector the necessary drive energy and consequently the right mechanical pump should be taken into consideration. The wrong choice in this context, based on the pure investment costs only, could lead to higher operating expenses during the whole life time.
How to avoid mistakes when designing bilge ejectors
A frequent mistake in technical specifications is to treat bilge ejectors in the same way as mechanical pumps. This ignores the fact that the behaviour of the performance curves of bilge ejectors and mechanical pumps is totally different. The design of an ejector always depends on the motive pressure related to the suction pressure and the discharge pressure. Nevertheless, you will find a number of vendors dealing with ejectors by catalogue. Therefore, you need to ensure you receive a quote for bilge ejectors with a constant total manometric head only.
The best solution for your individual application
Körting Hannover designs, manufactures and supplies a wide range of ejectors, regardless of the field of application or which material quality or design will be required.
Pumping liquids
Liquid jet liquid ejectors, used for bilging, stripping or ballasting of bilges, ballast tanks, engine rooms, chain lockers, bow thrusters, cofferdams, forepeaks, etc.
Conveying solids
Liquid or gas jet liquid ejectors, used to convey solids like filter material, sand grit, gravel, powders, etc. or to mix suspensions in offshore technology.
Compressing gases
Liquid jet gas compressors, used for the aeration and intermixing in biological sewage water treatment plants.
Heating liquids
Steam jet liquid heaters, used for the heating of liquids. These special types of heaters serve e.g. for the operation of sea water evaporators or for the heating of wash water.
Ventilating
Liquid jet ventilators used to ventilate void spaces and cargo holds or to draw off CO2 gases in an emergency.
Evacuating
Liquid, gas or steam jet vacuum ejectors, used to evacuate all kinds of technical systems. These ejectors serve e.g. for degassing on dredgers or for starting up evacuation of mechanical pumps.
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